PROBLEM TO BE SOLVED: To provide a ceramide production promoter, a humectant and a skin care preparation for external use.SOLUTION: The ceramide production promoter, the humectant and the skin care preparation for external use contain as an effective ingredient a compound represented by general formula (1). In the formula, R1-R3 are each independently hydrogen, a hydroxy group or an acyloxy group R4 is a hydroxy group or an acyloxy group when R4 is a hydroxy group, R5 is hydrogen and X is C=O and when R4 is an acyloxy group, R5 is hydrogen, a hydroxy group or an alkoxy group and X is C=O or CR6R7.COPYRIGHT: (C)2012,JPO&INPIT【課題】セラミド産生促進剤、保湿剤及び皮膚外用剤の提供。【解決手段】下記一般式(1)で表される化合物を有効成分として含有するセラミド産生促進剤、保湿剤及び皮膚外用剤。(式中、R1~R3は、それぞれ独立に水素、ヒドロキシル基又はアシルオキシ基を表す。R4はヒドロキシル基又はアシルオキシ基を表す。R4がヒドロキシル基の場合、R5は水素を表し、XはC=Oを表す。R4がアシルオキシ基の場合、R5は水素、ヒドロキシル基又はアルコキシ基を表し、XはC=O、又はCR6R7を表す。)【選択図】なし
